[Sync] Move //components/sync to the syncer namespace.

components/sync/driver/sync_type_preference_provider.h

Index: components/sync/driver/sync_type_preference_provider.h
diff --git a/components/sync/driver/sync_type_preference_provider.h b/components/sync/driver/sync_type_preference_provider.h
index b535378d2c5b92530eb852c69925ecd79b78aa2a..6ab1b3fb5c0c0f899b298fc506aaa81896b50083 100644
--- a/components/sync/driver/sync_type_preference_provider.h
+++ b/components/sync/driver/sync_type_preference_provider.h
@@ -7,12 +7,16 @@
 
 #include "components/sync/base/model_type.h"
 
+namespace syncer {
+
 class SyncTypePreferenceProvider {
  public:
-  virtual syncer::ModelTypeSet GetPreferredDataTypes() const = 0;
+  virtual ModelTypeSet GetPreferredDataTypes() const = 0;
 
  protected:
   virtual ~SyncTypePreferenceProvider() {}
 };
 
+}  // namespace syncer
+
 #endif  // COMPONENTS_SYNC_DRIVER_SYNC_TYPE_PREFERENCE_PROVIDER_H_